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| 1 | <?php |
| 2 | |
| 3 | declare(strict_types=1); |
| 4 | |
| 5 | namespace Phpdftk\Svg; |
| 6 | |
| 7 | /** |
| 8 | * SVG 2 §6.3 — `<view>` element. Defines a named viewport |
| 9 | * declaratively so external links can target a specific region |
| 10 | * of an SVG document via `file.svg#viewId`. Properties mirror |
| 11 | * the root `<svg>`: `viewBox`, `preserveAspectRatio`, optionally |
| 12 | * `zoomAndPan` and `viewTarget`. |
| 13 | * |
| 14 | * Server-side rendering only activates a view when the caller |
| 15 | * passes the fragment identifier explicitly. At document level |
| 16 | * the element never paints — it's a referenceable definition. |
| 17 | */ |
| 18 | final class View extends Element |
| 19 | { |
| 20 | public function __construct() |
| 21 | { |
| 22 | parent::__construct('view'); |
| 23 | } |
| 24 | |
| 25 | /** |
| 26 | * @return array{0: float, 1: float, 2: float, 3: float}|null |
| 27 | */ |
| 28 | public function viewBox(): ?array |
| 29 | { |
| 30 | $vb = $this->getAttribute('viewBox'); |
| 31 | if ($vb === null) { |
| 32 | return null; |
| 33 | } |
| 34 | $parts = preg_split('/[\s,]+/', trim($vb)) ?: []; |
| 35 | if (count($parts) !== 4) { |
| 36 | return null; |
| 37 | } |
| 38 | return [ |
| 39 | (float) $parts[0], |
| 40 | (float) $parts[1], |
| 41 | (float) $parts[2], |
| 42 | (float) $parts[3], |
| 43 | ]; |
| 44 | } |
| 45 | |
| 46 | public function preserveAspectRatio(): ?string |
| 47 | { |
| 48 | return $this->getAttribute('preserveAspectRatio'); |
| 49 | } |
| 50 | } |